User 4b4cc47e67 fix: use coverage circles instead of heatmap layer
Replace heatmap layer with concentric circle layers around scanner
positions. This avoids the z-index issue where heatmap appeared at
floor 0 below all markers.

Shows three coverage rings:
- Green inner (good signal ~5m)
- Yellow middle (fair signal ~10m)
- Red outer (weak signal ~15m)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-01 10:39:20 +01:00
2026-02-01 04:15:42 +01:00
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